From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter to J. Woodhead & Sons Ltd. regarding spring deflection and rebound testing.
| Identifier | ExFiles\Box 42\3\ Scan218 | |
| Date | 20th August 1928 | |
| 73854 c. to ROY.{Sir Henry Royce} Expl: Dept: HS{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG: 20th. Aug. 1928. Messrs. J.{Mr Johnson W.M.} Woodhead & Sons Ltd., Kirkstall Rd., LEEDS. Dear Sirs, With reference to your letter of the 16th.inst. ref. THS/HB.{C. E. Harcombe} The deflection on these springs is approximately 1½" from their normal load position and they reach approximately the same rebound. As you are probably aware, the springs are mounted on an actual chassis, the front wheels of which are located on two drums. A cam on each drum located at 180º in turn strikes the wheel 105 times per min. (One cam on each drum only.) The actual spring deflection and rebound depend somewhat on the type of shock absorber employed and the internal damping of the spring, but we can fairly say in this case that the movement from rest is about plus and minus 1½". The cam hits the wheel 6,300 times per hr., therefore each spring is deflected ± 1.5" 6,300 times/hr.running. Yours faithfully, | ||